@arubislander - thank you for your suggestion
already tried ubuntu core - great in theory - but many shortcomings in practice - ubuntu core is tightly controller and has licensing requirements. cannot install as an msp and manage multiple customer sites - all the devices are registered under one e-mail. have to register each device with ubuntu and there is no side loading. ubuntu core + Mir display server + ubuntu frame for single apps is an ideal scenario. Instead of ubuntu core, we tried with ubuntu server minimal install with mir+ubuntu frame so that we have full control on the environment - it works reasonably well. the ubuntu frame has major limitations - it is only a full display browser shell - cannot do regular app. It is wayland only - most of the remote access software do not work well with wayland.

@ikoz , @fave, @Valarayys - than you for the education

only need an android like the UI with the main utilities + debian linux base - the device will run a single app (.net blazor hybrid) - both are good suggestions - will explore that -
Debian+Mobile DE would be ideal - unfortunately not that literate to know how to go about it in a way that we can create and deploy in production and maintain/update it in a consistent way.

Hello , keen to know if we can possibly use Ubuntu touch in production environments for IoT use cases.

It would be ideal if we can use Ubuntu Touch. Our boards are generic, with one based on RPi CM4 and another based on Rockchip 35xx (3566/68).

Our main requirements is a simple UI for basic navigation and settings. We do not use voice or any of the mobile phone related usage. Currently Debian with XFCE works, but it is clumsy to use.

It would be great if someone can point me to docs and other relating information to help us start porting for RPi CM4.

Any help would be much appreciated.